[t] set environment in test
[t] set environment in test

nginx will set env to the correct value **after** running init_by_lua
so the env values set like `env FOO=bar;` are not visible for code
evaluated in the init_by_lua
however, they are properly forwarded if they are set before

3scale/docker-gateway,3scale/apicast,3scale/apicast,3scale/docker-gateway,3scale/apicast,3scale/apicast